?? ??????? ???????????12?
????:1???????????:???????????
2?????
3????????
4???????
5?????vx
???????11??????????30?????? (?????????? ????)11??30????,??,??????????,????30????????????,12?1??3??,??,????12??
30??????????????,???????,?,???11????30???????????????12??1???????????????????,??12????1??2??????????????????
???????,?10????????????,??????20???,??????
????????,?,?????
?,12??????????1?3???????,??????4???????????6?,??????????????????,??????????????????8????????????10?,??12????4????????????6?,???????????????????7??????8?????????,?9???????????????
?,??????????????,?????????,11?30?12???????????2?,???,?????
12?????2???????????5??????,??????,??????????????????????????????
??????????,???????????????????????????,??????,??,???????????,?,?,?????????????,?????????,????,?,??(??) ????????:??